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How to upgrade the firmware of S15?
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How to change the language for S15?
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Instructions for the system settings-audio menu for S15
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Instructions for the system settings-display menu of S15
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Instructions for the system settings-general menu of S15
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Instructions for the settings-audio/display/system setting menu of S15
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Introduction of the eleven working modes of S15
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Introduction to some scenarios of use of S15
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How to use Android Mode/Pure Music Mode on the S15
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How to use the AirPlay function in S15?